Doing the Math

Factors to consider in your calculation

1.- Determine the total time the restrooms should be available.

  • Under normal conditions, most people will use sanitation facilities once every 4 hours.

2.- Determine how many people will attend.

  • If you’ll need the restrooms for multiple data then use the longest day and the peak attendance expected as a reference.

3.- If beverages or alcohol will be served, add 15% to 20% more restrooms.

4.- If there’s a higher ratio of women-to-men attending, add 15% to 20%.

5.- Add one handicap restroom per 20 standard restrooms or a minimum of one for events open to the public.

6.- Adequate hand-washing should also be provided with restrooms in all food service areas.

Restroom Calculator - Worksite

EmployeesHours per WeekRestrooms Needed
1-10401
11-20402
21-30403
31-40404
Over 4040Add 1 for every 10 employees

Restroom Calculator - Event

Attendees1 hour2 hours3 hours4 hours5 hours6 hours7 hours8 hours9 hours10 hours
0-501112222222
51-1002222333333
101-2503333444466
251-5004446668888
501-750446668881010
751-1,00066688812121212
2,000888881212121216
3,0008121516181818192021
4,00010161822242525272728
5,00012202427293132343535
6,00014242833353737394042
7,00018283438404246464848
8,00020323844485050505254
9,00022324248525454565864
10,00024384854586264666872